Photo-Current Enhancement at Cu/p-Cu2O/rGO- Electrolyte Interface

A considerable photo-current enhancement was found at the Cu/p-Cu2O/rGO-electrolyte interface in a photo-electrochemical cell with compared to that of Cu/p-Cu2O-electrolyte interface. The reason for the photo-current enhancement may be due to the efficient charge separation process provided at Cu/p-Cu2O/rGO-electrolyte interface. Here rGO (reduced graphene oxide) acts as an electron acceptor for the photo-generated charge carriers as it readily accept electrons from the conduction band of p-Cu2O. rGO was synthesized using electro-phoretic deposition (EPD) technique. Fabricated samples were characterized using diffuse reflectance spectra, photo-current action spectra and the time development of the photocurrent of photo-electrochemical cells.

In Vitro Culture-An Alternative Method for The Enhanced Production of Some Volatile Components of Ocimum Citriodorum Vis.

Ocimum plants are highly valued for their effective antibacterial, anti-fungal, antioxidant and therapeutic activities. These properties are attributed to some active metabolites. In order to enhance and develop an alternative source for the production of such active components, a comparative study was carried out. Composition of volatile organic compounds emitted by in vitro shoots, calli derived from leaf and nodal explant of Ocimum citriodorum Vis. were studied using Gas Chromatography-Mass Spectroscopy (GC-MS) and compared to those emitted by mother plants. Solvent extraction method was used for obtaining essential oils from the samples. Total 18 volatile compounds from the leaf extract of mother plant, 14 volatile compounds from the leaf extract of in vitro regenerated plants, 5 volatile compounds from the calli derived from leaf and 10 volatile compounds from the calli derived from nodal explant were identified. The content of nerol (2.44%) and geranylacetate (1.53%) was greater in in vitro regenerated plantlets than in comparison to mother plant (nerol- 0.88% and geranylacetate- 0.32%). Seven new compounds (isocaryophyllene, b-farnesene, b-himachalene, globulol, geranylformate, b-citronellylacetate, citronellylisobutyrate) were identified from the in vitro regenerated plants while six and three new compounds were identified from the calli derived from nodal explant (geraniol, trans-b-bergamotene, b-longipinene, bergamotene, geranylformate and b-citronellyacetate) and leaf (b-curcumene, trans-b-bergamotene, b-citronellol) respectively. From the present study, it can be concluded that in vitro propagated plants as well as calli derived from leaf and nodal segment may be used as an alternate source for the increased production of bioactive compounds.

Photo-Current Enhancement in the Cu/rGO/n-Cu2O Photo-Electrode at Electrolyte Interface

A simple method was found to fabricate Cu/rGO/n-Cu2O photo-electrode to enhance the photocurrent with compared to the device Cu/n-Cu2O photo-electrode at semiconductor-electrolyte interface. Reduced graphene oxide (rGO) was fabricated on a well cleaned copper sheet using electro-phoretic deposition (EPD) technique to fabricate Cu/rGO. Thereafter Cu/rGO electrode was boiled in a 10-4M CuSO4 solution to fabricate Cu/rGO/n-Cu2O photo-electrode for the first time. Here The rGO acts as a good electron acceptor ton-Cu2O photo-generated electrons enhancing the charge separation process suppressing the recombination process of the photo-generated charge carriers.

Sugarcane Bagasse Ash and Its Role During the Hydration of Portland Cement

The utilization of waste materials in concrete manufacture provides a satisfactory solution to some of the environmental concerns and problems associated with waste management. Agro wastes such as rice husk ash, wheat straw ash, hazel nutshell and sugarcane bagasse ash are used as pozzolanic materials for the development of blended cements. India being one of the largest producers of sugarcane in the world, produces 300 million tons per year and large quantity of sugarcane bagasse is available from sugar mills. Sugarcane bagasse is partly used as fuel at the sugar mill. In the present paper, sugarcane bagasse was burned at 600oC and the ash obtained is known as sugarcane bagasse ash (SCBA) and characterized by using different techniques. SCBA was mixed with OPC in different proportions and the hydration studies were made. Mechanism of hydration has been discussed.

An Efficient Synthesis of Bis (Indolyl) Methanes Under Solvent Free Condition Using Silica Supported Polyphosphoric Acid (PPA-SiO2) as Recyclable Catalyst

Silica supported poly-phosphoric acid (PPA-SiO2) has been utilized as an efficient and an environmentally friendly heterogeneous, reusable catalyst for the synthesis of bis(indolyl)methanes under solvent free condition. The significances of this protocol are mild reaction condition, excellent yield and simple work up procedure.

Analysis of Wireless Sensor Networks Security Solutions and Countermeasures

Wireless Sensor Network is special type of Ad-hoc network formed with autonomous motes with power and memory constraint. WSN is used in various applications such as healthcare, Environmental monitoring, habitat monitoring military, ecology, home and many more practicable solution for challenging applications of different areas. When wireless sensor networks are deployed in an open, hostile or specific defense environment the security becomes extremely important, since WSN motes are resource constraint there is scope for different types of malicious attacks on them. This paper analyses the security solutions and the security mechanisms that will overcome security issues and attacks and recommends adequate solution for the WSN threats.